#3415 feat: Add `flattening_separator` as an additional flattening config Pull request opened by iamlorax # Description This PR allows users to set the

flattening_separator

config along side the other flattening options. It is used override the default separator of "__". # Related Issues Closes #3401 ## Summary by Sourcery Add support for configuring a custom flattening separator and validate it in flattening utilities. New Features: • Allow plugins to specify a custom flattening_separator in flattening configuration to override the default separator. Tests: • Add tests to verify get_flattening_options accepts flattening_separator and that flatten_schema and flatten_record honor a custom separator value. meltano/sdk